LEESON SCR Thyristor Motor Control - Manual (Page 58)

52 Troubleshooting SPEEDMASTER™ OPERATION MANUAL
Symptom Possible
Causes
Suggested
Solutions
Line fuse does not
blow or circuit breaker
does not trip, but the
motor does not run
(cont.)
Motor runs too fast at
maximum speed
setting
Motor runs too slow or
too fast
Motor will not reach
the desired speed.
3. Drive is in current limit.
4. Drive is not receiving
AC line voltage.
5. Motor is not connected.
1. MIN SPD and MAX
SPD settings are too
high.
MIN SPD and MAX SPD
are not calibrated.
1. MAX SPD setting is too
low.
2. IR COMP setting is too
low.
3. Motor is overloaded.
3. Verify that the motor is
not jammed. Increase
TORQUE setting (page
39).
4. Apply AC line voltage
to L1 and L2.
5. Connect motor to A1
and A2.
1. Recalibrate MIN SPD
(page 37) and MAX
SPD (page 38).
1. Recalibrate MIN SPD
(page 37) and MAX
SPD (page 38).
1. Increase MAX SPD
setting (page 38).
2. Increase IR COMP
setting (page 38).
3. Check motor load.
Resize the motor or
drive if necessary.